Attempt to fix build warning related to 64bit builds.
Attempt to fix build warning related to 64bit builds.

GNOME/at-spi2-core,Distrotech/at-spi2-atk,Distrotech/at-spi2-atk,GNOME/at-spi2-core,GNOME/at-spi2-atk,GNOME/at-spi2-core